*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #232c33;
}
.Navigation{
    position: relative;
    width: 70px;
    height: 500px;
    background-color: #2b343b;
    box-shadow:10px 0 0 #4187f6;
    border-left: 10px solid #2b343b;
    overflow: hidden;
    transition: width 0.5s;
}

.Navigation:hover{
    width: 300px;
}

.Navigation ul{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding-left: 5px;
    padding-top: 40px;
}

.Navigation ul li{
    position:relative;
    list-style-type: none;
    width: 100%;
    line-height: 60px;
    height: 60px;
    border-top-left-radius: 20px;
    border-bottom-left-radius: 20px;
}

.Navigation ul li.active a::before{
    content: "";
    position: absolute;
    top: -30px;
    right: 0px;
    width: 30px;
    height: 30px;
    background-color: #2b343b;
    border-radius: 50%;
    box-shadow: 15px 15px 0 #4187f6;
}

.Navigation ul li.active a::after{
    content: "";
    position: absolute;
    top: 60px;
    right: 0px;
    width: 30px;
    height: 30px;
    background-color: #2b343b;
    border-radius: 50%;
    box-shadow: 15px -15px 0 #4187f6;
}

.Navigation ul li.active{
    background-color: #4187f6;
}

.Navigation ul li a{
    position:relative;
    display: block;
    width: 100%;
    display: flex;
    text-decoration: none;
    color: #fff;    
}

.Navigation ul li a .iconfont{
    position: relative;
    display: block;
    min-width: 60px;
    height: 60px;
    line-height: 60px;
    text-align: center;
    font-size: 1.5em;
    z-index: 1;
}

.Navigation ul li a .title{
    padding-left: 20px;
}